package com.tegtech.common.utils.http;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;

/**
 * 客户端工具类
 * 
 * @author Jun
 */
public class ServletUtils {
	
	/**
	 * 获取String参数
	 */
	public static String getParameter(String name) {
		return getRequest().getParameter(name);
	}

	/**
	 * 获取String参数
	 */
	public static String getParameter(String name, String defaultValue) {
		return Convert.toStr(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name) {
		return Convert.toInt(getRequest().getParameter(name));
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name, Integer defaultValue) {
		return Convert.toInt(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取request
	 */
	public static HttpServletRequest getRequest() {
		return getRequestAttributes().getRequest();
	}

	/**
	 * 获取response
	 */
	public static HttpServletResponse getResponse() {
		return getRequestAttributes().getResponse();
	}

	/**
	 * 获取session
	 */
	public static HttpSession getSession() {
		return getRequest().getSession();
	}

	public static ServletRequestAttributes getRequestAttributes() {
		RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
		return (ServletRequestAttributes) attributes;
	}

	/**
	 * 自定义响应信息
	 *
	 * @param response	响应对象
	 * @param data		响应信息
	 */
	public static <T> void reponseData(HttpServletResponse response, T data) {
		response.setStatus(200);
		response.setCharacterEncoding("UTF-8");
		response.setContentType("application/json");
		try(PrintWriter out = response.getWriter()) {
			out.println(JSONUtil.toJsonStr(data));
			out.flush();
		}catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 是否是Ajax异步请求
	 * 
	 * @param request
	 */
	public static boolean isAjaxRequest(HttpServletRequest request) {
		String accept = request.getHeader("accept");
		if (accept != null && accept.indexOf("application/json") != -1) {
			return true;
		}

		String xRequestedWith = request.getHeader("X-Requested-With");
		if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1) {
			return true;
		}

		String uri = request.getRequestURI();
		if (StrUtil.containsAnyIgnoreCase(uri, ".json", ".xml")) {
			return true;
		}

		String ajax = request.getParameter("__ajax");
		if (StrUtil.containsAnyIgnoreCase(ajax, "json", "xml")) {
			return true;
		}
		return false;
	}
	
}
